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Repair
™
FinishPro 390/395
Airless/Air-Assisted Sprayer
311911C
- For the application of architectural paints and coatings -
Maximum Fluid Working Pressure: 3300 psi (227 bar, 22.7 MPa)
Maximum Air Working Pressure: 35 psi (2.4 bar, 0.24 MPa)
IMPORTANT SAFETY INSTRUCTIONS!
Read all warnings and instructions. Save these instructions. Contact Graco Customer Ser-
vice, your local Graco distributor or our website: www.graco.com, to obtain a manual in your lan-
guage.
Models:
FinishPro 395
Region
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Warning Warning The following warnings are for the setup, use, grounding, maintenance and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbol refers to procedure-specific risks. Refer back to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where appli- cable. WARNING FIRE AND EXPLOSION HAZARD Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To he
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Warning WARNING EQUIPMENT MISUSE HAZARD Misuse can cause death or serious injury. � Do not exceed the maximum working pressure or temperature rating of the lowest rated system component. Read Technical Data in all equipment manuals. � Use fluids and solvents that are compatible with equipment wetted parts. Read Technical Data in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information about your material, request MSDS from distributor or retailer. � Chec
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Component Identification Component Identification 21 13 10 9 8 FinishPro 390 11 7 6 17 12 1 18 4 5 2 3 20 ti9018a 19 9 FinishPro 395 8 10 4 7 15 12 6 17 11 18 5 3 2 14 16 ti9021a 1 20 19 4 311911C
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Component Identification Component Identification Item Component 1 Prime/Drain Tube/Hose 2 Air Hose Connection 3 Prime/Spray Valve 4 Fluid Outlet 5 Air/Fluid Supply Hose 6 Displacement Pump 7 Gun (see manual) 8 Filter Manifold 9 Fluid Pressure Control 10 Power/Function Selector 11 Suction Tube 12 Gun Air Regulator 13 Direct Immersion Tube (FinishPro 390 model only) 14 Sprayer Air Pressure Regulator (FinishPro 395 model only) 15 Digital Display (FinishPro 395 model only) 16 Air Pressure Gauge (Fi
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Installation Installation Recommended extension cords for use with this Grounding and Electric sprayer: Requirements 2 � 3-wire, 12 AWG (2.5 mm ) minimum, 300 ft. (90 m) maximum length. Smaller gauge or longer extension cords may reduce sprayer performance. The sprayer cord includes a grounding wire with an Spray gun: ground through connection to a properly appropriate grounding contact. grounded fluid hose and pump. Fluid supply container: follow local code. Solvent and Oil-based fluids:
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Pressure Relief Procedure Pressure Relief Procedure General Repair Information Flammable materials spilled on hot, bare, motor could Follow this Pressure Relief Procedure whenever you cause fire or explosion. To reduce risk of burns, fire or are instructed to relieve pressure, stop spraying, check or explosion, do not operate sprayer with cover removed. service equipment or install or clean spray tip. � Keep all screws, nuts, washers, gaskets, and electri- 1. Set function selection switch to
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Troubleshooting Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Sprayer Won’t Operate Basic Fluid Pressure 1. Pressure control knob setting. Motor Slowly increase pressure setting to see if motor will not run if set at minimum (fully starts. counter-clockwise). 2. Spray tip or fluid filter may be Relieve pressure, page 7. Then clear clog or clean clogged. gun filter. Refer to gun instruction manual, 311937. Basi
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Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Basic Electrical 1. Electric supply. Meter must read Reset building circuit breaker, replace building fuses. See wiring diagram, page 36 105-130 Vac for 110-120 Vac models Try another outlet. and 210-255 Vac for 230 Vac mod- els. 2. Extension cord. Check extension Replace extension cord. Use shorter extension cord. cord continuity with volt meter. 3. Sprayer power su
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Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Low Fluid Output 1. Worn spray tip. Relieve pressure, page 7. Replace tip. Refer to gun instruction manual, 311937. 2. Verify pump does not continue to Service pump. See page 13, Displacement Pump stroke when gun trigger is released. Replacement. 3. Prime valve leaking. Relieve pressure, page 7. Then repair prime valve. See page 28, Pressure Control Replacement. 4
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Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Motor runs and pump strokes 1. Prime Valve Open. Close prime valve. 2. Paint supply. Refill and reprime pump. 3. Intake strainer clogged. Remove and clean, then reinstall. 4. Suction hose leaking air. Tighten nut. Check o-rings on swivel. 5. Intake valve ball and piston ball are See Pump Manual 309250. Strain paint before using seating properly. to remove particles t
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Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Low air output at gun 4. Damaged (leaking) air supply hose. Replace air supply hose. 5. Air intake filter clogged. Clean or replace air intake filter kit. 6. Mechanical air unloader stuck open. Replace mechanical air unloader. 7. Electrical air unloader stuck open. Replace electrical air unloader. Air compressor does not run Set function selector switch to AA; replac
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Displacement Pump Replacement Displacement Pump Replacement See manual 309250 for pump repair instructions. 6. Using a flat screwdriver, push retaining spring (C) up. Push out pump pin (32). Removal C 1. Relieve pressure, page 7. Unplug sprayer from out- let. 2. Loosen two screws (30) and rotate cover (44). 32 44 30 7. Using a hammer, loosen pump jam nut (11). Unscrew and remove pump (9). ti6140a 3. Loosen nut (A) and remove suction hose (35). Loosen nut (B) and remove the high pressure hose
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Displacement Pump Replacement 5. Screw in pump until threads are flush with top of Installation drive housing opening. If pump pin works loose, parts could break off due to force of pumping action. Parts could project through air and result in serious injury or property damage. ti6111a CAUTION 6. Align pump outlet (E) to back. If the pump jam nut loosens during operation, the threads of the drive housing will be damaged. 1. Extend pump piston rod full. Apply grease to top of pump rod at (
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Drive Housing Replacement Drive Housing Replacement Installation 1. Apply a liberal coat of grease to gears and needle bearing surfaces. Install thrust bearing (4) and gears (2) and (3) in front endbell housing. Removal Needle 3 Bearing Surfaces 1. Relieve pressure, page 7. 4 2. Remove pump (9). Displacement Pump Replace- ment, page 13. 3. Disconnect power cord from outlet. 3 ti8329b 5 2 7 2. Push drive housing into front endbell housing. Insert 6 32 gear crank (3) through hole in connectin
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Spin Test Spin Test See Wiring Diagram, page 36. Armature, Brushes, and Motor Wiring Open Circuit Test (Continuity) 1. Connect red and black motor leads with test lead. Turn motor fan by hand at about two revolutions per second. 2. If uneven or no resistance, check for missing brush To check armature, motor winding and brush electrical caps, broken brush springs, brush leads, and worn continuity: brushes. Repair as needed, page 18. 1. Relieve pressure, page 7. Disconnect power cord 3. If
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Fan Replacement 3. Remove spring clip (1b) on back of motor. Fan Replacement 4. Pull off fan (100). Installation 1. Slide new fan (1a) in place on back of motor. Be sure blades of fan face motor as shown. FinishPro 390 Removal 2. Install spring clip (1b). 1. Relieve pressure, page 7. Disconnect power cord from outlet. 3. Replace shroud (29) and two screws (30). 2. Remove two screws (30) and shroud (29). 1a 1b 30 29 ti9269a FinishPro 395 1. Relieve pressure, page 7. Disconnect power cord from
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Motor Brush Replacement Motor Brush Replacement See Wiring Diagram, page 36. 2. Push each cap (A) into place over brush. Orient each cap with the 2 projections on either side of the brush lead. You will hear a “snap” when cap is securely in place. 3. Using a wire stripper, strip off wire insulation approx- imately 1/4 inch (6 mm) from the end of each yellow wire (C) to the motor. FinishPro 390 4. Insert stripped end into end of a butt splice (E) on Removal new brush assembly. Replace bru
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Motor Brush Replacement Motor Brush Replacement 6. Inspect commutator for excessive pitting, burning, or FinishPro 395 gouging. A black color on commutator is normal. Have commutator resurfaced by a motor repair shop Removal if brushes wear too fast. Replace brushes worn to less than 1/2 in. Brushes wear Installation differently on each side of motor, check both sides. Brush Repair Kit 287735 is available. CAUTION 1. Read General Repair Information, page 7. When installing brushes, follow
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Control Board Replacement Control Board Replacement See Wiring Diagram, page 36. 6. Pull control board out slightly and then slide it back and off of frame. Make sure power cord is free and not wrapped around cord wrap. FinishPro 390 7. Remove grommet and wires from strain relief. Removal . Ground wire will remain attached to sprayer with 1. Relieve pressure, page 7. Disconnect power cord grounding screw. from outlet. 2. Remove two screws (30) and shroud (29) (see illus- tration, page16).
